Cleanup of math sources.

corelib/unified/math/base.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// A part of the dart:math library.
-
-/**
- * Base of the natural logarithms.
- */
-final double E = 2.718281828459045;
-
-/**
- * Natural logarithm of 10.
- */
-final double LN10 =  2.302585092994046;
-
-/**
- * Natural logarithm of 2.
- */
-final double LN2 =  0.6931471805599453;
-
-/**
- * Base-2 logarithm of E.
- */
-final double LOG2E = 1.4426950408889634;
-
-/**
- * Base-10 logarithm of E.
- */
-final double LOG10E = 0.4342944819032518;
-
-/**
- * The PI constant.
- */
-final double PI = 3.1415926535897932;
-
-/**
- * Square root of 1/2.
- */
-final double SQRT1_2 = 0.7071067811865476;
-
-/**
- * Square root of 2.
- */
-final double SQRT2 = 1.4142135623730951;
-
-/**
- * Parses a [String] representation of an [int], and returns an [int]. Throws a
- * [FormatException] if [str] cannot be parsed as an [int].
- */
-external int parseInt(String str);
-
-/**
- * Parses a [String] representation of a [double], and returns a [double].
- * Throws a [FormatException] if [str] cannot be parsed as a [double].
- */
-external double parseDouble(String str);
-
-/**
-  * Returns the minimum of two numbers. If either argument is NaN returns NaN.
-  * The minimum of [:-0.0:] and [:0.0:] is [:-0.0:]. If both arguments are
-  * equal (int and doubles with the same mathematical value are equal) then
-  * it is unspecified which of the two arguments is returned.
-  */
-num min(num a, num b) {
-  if (a is num) {
-    // TODO(floitsch): merge this if into the previous one, once dart2js
-    // correctly propagates types for logical ands.
-    if (b is num) {
-      if (a > b) return b;
-      if (a < b) return a;
-      if (b is double) {
-        // Special case for NaN and -0.0. If one argument is NaN return NaN.
-        // [min] must also distinguish between -0.0 and 0.0.
-        if (a is double) {
-          if (a == 0.0) {
-            // a is either 0.0 or -0.0. b is either 0.0, -0.0 or NaN.
-            // The following returns -0.0 if either a or b is -0.0, and it
-            // returns NaN if b is NaN.
-            return (a + b) * a * b;
-          }
-        }
-        // Check for NaN and b == -0.0.
-        if (a == 0 && b.isNegative() || b.isNaN()) return b;
-        return a;
-      }
-      return a;
-    }
-    throw new IllegalArgumentException(b);
-  }
-  throw new IllegalArgumentException(a);
-}
-
-/**
-  * Returns the maximum of two numbers. If either argument is NaN returns NaN.
-  * The maximum of [:-0.0:] and [:0.0:] is [:0.0:]. If both arguments are
-  * equal (int and doubles with the same mathematical value are equal) then
-  * it is unspecified which of the two arguments is returned.
-  */
-num max(num a, num b) {
-  if (a is num) {
-    // TODO(floitsch): merge this if into the previous one, once dart2js
-    // correctly propagates types for logical ands.
-    if (b is num) {
-      if (a > b) return a;
-      if (a < b) return b;
-      if (b is double) {
-        // Special case for NaN and -0.0. If one argument is NaN return NaN.
-        // [max] must also distinguish between -0.0 and 0.0.
-        if (a is double) {
-          if (a == 0.0) {
-            // a is either 0.0 or -0.0. b is either 0.0, -0.0, or NaN.
-            // The following returns 0.0 if either a or b is 0.0, and it
-            // returns NaN if b is NaN.
-            return a + b;
-          }
-        }
-        // Check for NaN.
-        if (b.isNaN()) return b;
-        return a;
-      }
-      // max(-0.0, 0) must return 0.
-      if (b == 0 && a.isNegative()) return b;
-      return a;
-    }
-    throw new IllegalArgumentException(b);
-  }
-  throw new IllegalArgumentException(a);
-}
-
-/**
- * Returns the arc tangent of [a]/[b] with sign according to quadrant.
- */
-external double atan2(num a, num b);
-
-/**
- * If the [exponent] is an integer the result is of the same type as [x].
- * Otherwise it is a [double].
- */
-external num pow(num x, num exponent);
-
-// TODO(4512): Add documentation.
-external double sin(num x);
-external double cos(num x);
-external double tan(num x);
-external double acos(num x);
-external double asin(num x);
-external double atan(num x);
-external double sqrt(num x);
-external double exp(num x);
-external double log(num x);